Generating a heightmap 2004-02-24 - By Lucas Meijer
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Ian Thomas wrote:
> Lucas,
> Thanks... I actually tried that (and it was very, very slow.)
Hmm.. well for the sake of argument, and not to mean that this is the
best method, a few thoughts on speeding it up:
- don't mode the far clipping plane a small about closer, but say twice
as close each time. If you've gone too far, push it back 50%, etc...
that should limit the amount of times you need to check if a render is
totally black.
- to speed up checking if a render is totally black, make the bgcolor
black, and have all shaders render pure white. Then you can copyPixel
your image down to a much smaller image. If there was a pure white pixel
present in the original, it will be much darker in the small image, but
that doesn't matter, you only want to know if something is totally black
or not. You'll have to do a few tests with the copypixels command
however to examin exactly how it performs its downscaling, and to see
how far you can scale down without getting a risk of 'missing' a white
pixel.
I haven't actually ever tried what happens when you compare two image
references with eachother... does it check the actual pixel content, or
does it only tell me if they're referencing the same object or not? If
it's the former you can just make your own black image, and check if
renderImage<>blackImage then etc..
Anyway, I think it would be a lot easier to use a 3d authoring app, but
since you're working from lingo I assume you don't have access to one.
Bye, Lucas
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